USA is my first favorite place of bitcoin though there are some other countries where bitcoins legal.but usa is the best place.Easily you can cash in your currency by bitcoin atm machine. And easily can trade with exchange. But i think in near future the best place of bitcoin will increase. Because its blockchain technology is going to more popular whole over the world and government of many countries will approve it in their country.
The best place for me is my home where my family live. My family is the reason why I strive so hard and I believe that I'll be the most happy if I will be able to take advantage of the bitcoin's benefit with them.